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Installation and commissioning of the modems and routers
5.7 Analog dial-up modem MD3
To configure profile 15 proceed as follows:
1. Power supply of the modem OFF.
2. Set standard profile 15 on the modem (with the DIL switch SW2).
3. Connect the modem to the PC via its RS-232 interface.
4. Power supply of the modem ON.
5. Using the terminal program transfer the required AT commands to the MD3 according to
the tables.
Note
If in addition to the AT strings listed in the table, you want to transfer further AT
commands to the modem, these need to be entered before the AT sequence &L1&W15.
The reason for this is that the modem changes to online mode after the AT command
&L1 and this means that no more AT commands can be transferred to the MD3. In this
case, the modem first needs to be reset with the switch SW2.7 and then reconfigured.
Note
If the modem is reset with DIL switch SW2.7, profile 15 once again has the factory
setting. Profile 15 then needs to be configured again.
5.7.7
LTOP line transformer with overvoltage protection
Introduction
Copper dedicated lines are highly susceptible to electromagnetic interference. The coupling
of extraneous voltages can be inductive or capacitive, for example due to the effects of
lightning. Direct conductive coupling is also possible due to bad insulation.
The LTOP (Line Transformer with Overvoltage Protection) limits extraneous voltages and
overvoltages to a non-critical level. The floating transformer also provides electrical isolation
preventing coupling of voltages into other cable sections.
Note
The LTOP line transformer with overvoltage protection is intended only for connection to
dedicated lines. For dial-up network applications, other suitable overvoltage protection
modules should be used. Companies such as Phoenix and Dehn offer TAE6 and RJ-12
outlets with overvoltage protection.
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SINAUT ST7 station control system
System Manual, 09/2016, C79000-G8976-C178-10
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